Many popular apps will cost you a dollar or two to purchase. While these apps are cheap on their own, buying them does add up. Plus, there’s a good chance that you won’t use them again. Localytics found that 20 percent of apps that are purchased are used only once. While some apps are useful, others aren’t worth a dollar of your hard-earned money. Before you buy an app, consider if you’ll really ever use it. Only download the apps that you can see proving to be useful in the future. Also, be sure to avoid using apps that are free to download, but that make you pay for in-app purchases. These in-app purchases are also usually not worth the cost, and you also typically won’t use them more than once or twice.